Which of the following is a modified stem? Select all that apply.A) RhizomeB) TendrilC) SpineD) TuberE) Corm
What will be an ideal response?
A, B, D, E
Spines form from modified leaves not stems. For a detailed description of the types of modified stems please read Section 29.4.
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Agricultural lands frequently require nutrient augmentation because _____
A) nitrogen-fixing bacteria are not as plentiful in agricultural soils because of the use of pesticides B) the nutrients that become the biomass of plants are not cycled back to the soil on lands where they are harvested C) land that is available for agriculture tends to be nutrient-poor D) grains raised for feeding livestock must be fortified, and thus require additional nutrients E) cultivation of agricultural land inhibits the decomposition of organic matter
Lactobacilli are alkalophilic, preferring conditions that are slightly alkaline for optimal growth.
Answer the following statement true (T) or false (F)
What is the main benefit of identifying biodiversity hotspots?
a. Protecting endemic species b. Restoring keystone species c. Facilitating captive breeding d. Monitoring climate change
An elk herd is observed over many generations. Most of the full-grown bull elk have antlers of nearly the same size, although a few have antlers that are significantly larger or smaller than this average size. The average antler size remains constant
over the generations. Which of the following effects probably accounts for this situation? A) directional selection B) stabilizing selection C) a bottleneck effect that resulted in low genetic diversity D) a high rate of gene flow